<template>
  <div class="sfContainer">
    <div class="left-board">
      <div class="left-scrollbar sfScroll">
        <div class="components-list">
          <div v-for="(item, listIndex) in leftComponents" :key="listIndex">
            <div class="components-title">
              <svg-icon icon-class="component" />
              {{ item.title }}
            </div>
            <draggable
              class="components-draggable"
              :list="item.list"
              :group="{ name: 'componentsGroup', pull: 'clone', put: false }"
              :clone="cloneComponent"
              draggable=".components-item"
              :sort="false"
              @end="onEnd"
            >
              <div
                v-for="(element, index) in item.list"
                :key="index"
                class="components-item"
                @click="addComponent(element)"
              >
                <div class="components-body">
                  <svg-icon :icon-class="element.__config__.tagIcon" />
                  {{ element.__config__.label }}
                </div>
              </div>
            </draggable>
          </div>
        </div>
      </div>
    </div>

    <div class="center-board">
      <div class="action-bar">
        <!-- <el-button icon="el-icon-video-play" type="text" @click="run">
          运行
        </el-button>
        <el-button icon="el-icon-view" type="text" @click="showJson">
          查看json
        </el-button> -->
        <el-button icon="el-icon-download" type="text" @click="download">
          导出vue文件
        </el-button>
        <!-- <el-button icon="el-icon-view" type="text" @click="preview">
          预览
        </el-button> -->
        <el-button
          class="copy-btn-main"
          icon="el-icon-document-copy"
          type="text"
          @click="copy"
        >
          复制代码
        </el-button>
        <el-button
          class="delete-btn"
          icon="el-icon-delete"
          type="text"
          @click="empty"
        >
          清空
        </el-button>
      </div>
      <div class="center-scrollbar sfScroll">
        <el-row class="center-board-row" :gutter="formConf.gutter">
          <el-form
            :size="formConf.size"
            :label-position="formConf.labelPosition"
            :disabled="formConf.disabled"
            :label-width="formConf.labelWidth + 'px'"
          >
            <draggable
              class="drawing-board"
              :list="drawingList"
              :animation="340"
              group="componentsGroup"
            >
              <draggable-item
                v-for="(item, index) in drawingList"
                :key="item.renderKey"
                :drawing-list="drawingList"
                :current-item="item"
                :index="index"
                :active-id="activeId"
                :form-conf="formConf"
                @activeItem="activeFormItem"
                @copyItem="drawingItemCopy"
                @deleteItem="drawingItemDelete"
              />
            </draggable>
            <div v-show="!drawingList.length" class="empty-info">
              从左侧拖入或点选组件进行表单设计
            </div>
          </el-form>
        </el-row>
      </div>
    </div>

    <right-panel
      :active-data="activeData"
      :form-conf="formConf"
      :show-field="!!drawingList.length"
      @tag-change="tagChange"
      @fetch-data="fetchData"
    />

    <form-drawer
      :visible.sync="drawerVisible"
      :form-data="formData"
      size="100%"
      :generate-conf="generateConf"
    />
    <json-drawer
      size="60%"
      :visible.sync="jsonDrawerVisible"
      :json-str="JSON.stringify(formData)"
      @refresh="refreshJson"
    />
    <code-type-dialog
      :visible.sync="dialogVisible"
      title="选择生成类型"
      :show-file-name="showFileName"
      @confirm="generate"
    />
    <input id="copyNode" type="hidden" />
    <div id="preview"></div>
  </div>
</template>

<script>
import draggable from "vuedraggable";
import { debounce } from "throttle-debounce";
import { saveAs } from "file-saver";
import ClipboardJS from "clipboard";
import render from "../components/render/render";
import FormDrawer from "./FormDrawer";
import JsonDrawer from "./JsonDrawer";
import RightPanel from "./RightPanel";
import {
  inputComponents,
  selectComponents,
  layoutComponents,
  formConf,
} from "../components/generator/config";
import {
  exportDefault,
  beautifierConf,
  isNumberStr,
  titleCase,
  deepClone,
  isObjectObject,
} from "../utils/index";
import {
  makeUpHtml,
  vueTemplate,
  vueScript,
  cssStyle,
} from "../components/generator/html";
import { makeUpJs } from "../components/generator/js";
import { makeUpCss } from "../components/generator/css";
import drawingDefalut from "../components/generator/drawingDefalut";
// import logo from "@/assets/logo.png";
import CodeTypeDialog from "./CodeTypeDialog";
import DraggableItem from "./DraggableItem";
import {
  getDrawingList,
  saveDrawingList,
  getIdGlobal,
  saveIdGlobal,
  getFormConf,
} from "../utils/db";
import loadBeautifier from "../utils/loadBeautifier";

let beautifier;
const emptyActiveData = { style: {}, autosize: {} };
let oldActiveId;
let tempActiveData;
const drawingListInDB = getDrawingList();
const formConfInDB = getFormConf();
const idGlobal = getIdGlobal();

export default {
  components: {
    draggable,
    render,
    FormDrawer,
    JsonDrawer,
    RightPanel,
    CodeTypeDialog,
    DraggableItem,
  },
  data() {
    return {
      // logo,
      idGlobal,
      formConf,
      inputComponents,
      selectComponents,
      layoutComponents,
      labelWidth: 100,
      drawingList: drawingDefalut,
      drawingData: {},
      activeId: drawingDefalut[0].formId,
      drawerVisible: false,
      formData: {},
      dialogVisible: false,
      jsonDrawerVisible: false,
      generateConf: null,
      showFileName: false,
      activeData: drawingDefalut[0],
      saveDrawingListDebounce: debounce(340, saveDrawingList),
      saveIdGlobalDebounce: debounce(340, saveIdGlobal),
      leftComponents: [
        {
          title: "输入型组件",
          list: inputComponents,
        },
        {
          title: "选择型组件",
          list: selectComponents,
        },
        {
          title: "布局型组件",
          list: layoutComponents,
        },
      ],
    };
  },
  computed: {},
  watch: {
    // eslint-disable-next-line func-names
    "activeData.__config__.label": function (val, oldVal) {
      if (
        this.activeData.placeholder === undefined ||
        !this.activeData.__config__.tag ||
        oldActiveId !== this.activeId
      ) {
        return;
      }
      this.activeData.placeholder =
        this.activeData.placeholder.replace(oldVal, "") + val;
    },
    activeId: {
      handler(val) {
        oldActiveId = val;
      },
      immediate: true,
    },
    drawingList: {
      handler(val) {
        this.saveDrawingListDebounce(val);
        if (val.length === 0) this.idGlobal = 100;
      },
      deep: true,
    },
    idGlobal: {
      handler(val) {
        this.saveIdGlobalDebounce(val);
      },
      immediate: true,
    },
  },
  mounted() {
    if (Array.isArray(drawingListInDB) && drawingListInDB.length > 0) {
      this.drawingList = drawingListInDB;
    } else {
      this.drawingList = drawingDefalut;
    }
    this.activeFormItem(this.drawingList[0]);
    if (formConfInDB) {
      this.formConf = formConfInDB;
    }
    loadBeautifier((btf) => {
      beautifier = btf;
    });
    const clipboard = new ClipboardJS("#copyNode", {
      text: (trigger) => {
        const codeStr = this.generateCode();
        this.$notify({
          title: "成功",
          message: "代码已复制到剪切板，可粘贴。",
          type: "success",
        });
        return codeStr;
      },
    });
    clipboard.on("error", (e) => {
      this.$message.error("代码复制失败");
    });
  },
  methods: {
    setObjectValueReduce(obj, strKeys, data) {
      const arr = strKeys.split(".");
      arr.reduce((pre, item, i) => {
        if (arr.length === i + 1) {
          pre[item] = data;
        } else if (!isObjectObject(pre[item])) {
          pre[item] = {};
        }
        return pre[item];
      }, obj);
    },
    setRespData(component, resp) {
      const { dataPath, renderKey, dataConsumer } = component.__config__;
      if (!dataPath || !dataConsumer) return;
      const respData = dataPath
        .split(".")
        .reduce((pre, item) => pre[item], resp);

      // 将请求回来的数据，赋值到指定属性。
      // 以el-tabel为例，根据Element文档，应该将数据赋值给el-tabel的data属性，所以dataConsumer的值应为'data';
      // 此时赋值代码可写成 component[dataConsumer] = respData；
      // 但为支持更深层级的赋值（如：dataConsumer的值为'options.data'）,使用setObjectValueReduce
      this.setObjectValueReduce(component, dataConsumer, respData);
      const i = this.drawingList.findIndex(
        (item) => item.__config__.renderKey === renderKey
      );
      if (i > -1) this.$set(this.drawingList, i, component);
    },
    fetchData(component) {
      const { dataType, method, url } = component.__config__;
      if (dataType === "dynamic" && method && url) {
        this.setLoading(component, true);
        this.$axios({
          method,
          url,
        }).then((resp) => {
          this.setLoading(component, false);
          this.setRespData(component, resp.data);
        });
      }
    },
    setLoading(component, val) {
      const { directives } = component;
      if (Array.isArray(directives)) {
        const t = directives.find((d) => d.name === "loading");
        if (t) t.value = val;
      }
    },
    activeFormItem(currentItem) {
      this.activeData = currentItem;
      this.activeId = currentItem.__config__.formId;
    },
    onEnd(obj) {
      if (obj.from !== obj.to) {
        this.fetchData(tempActiveData);
        this.activeData = tempActiveData;
        this.activeId = this.idGlobal;
      }
    },
    addComponent(item) {
      const clone = this.cloneComponent(item);
      this.fetchData(clone);
      this.drawingList.push(clone);
      this.activeFormItem(clone);
    },
    cloneComponent(origin) {
      const clone = deepClone(origin);
      const config = clone.__config__;
      config.span = this.formConf.span; // 生成代码时，会根据span做精简判断
      this.createIdAndKey(clone);
      clone.placeholder !== undefined && (clone.placeholder += config.label);
      tempActiveData = clone;
      return tempActiveData;
    },
    createIdAndKey(item) {
      const config = item.__config__;
      config.formId = ++this.idGlobal;
      config.renderKey = `${config.formId}${+new Date()}`; // 改变renderKey后可以实现强制更新组件
      if (config.layout === "colFormItem") {
        item.__vModel__ = `field${this.idGlobal}`;
      } else if (config.layout === "rowFormItem") {
        config.componentName = `row${this.idGlobal}`;
        !Array.isArray(config.children) && (config.children = []);
        delete config.label; // rowFormItem无需配置label属性
      }
      if (Array.isArray(config.children)) {
        config.children = config.children.map((childItem) =>
          this.createIdAndKey(childItem)
        );
      }
      return item;
    },
    AssembleFormData() {
      this.formData = {
        fields: deepClone(this.drawingList),
        ...this.formConf,
      };
    },
    generate(data) {
      console.log(data,`exec${titleCase(this.operationType)}`);
      const func = this[`exec${titleCase(this.operationType)}`];
      this.generateConf = data;
      func && func(data);
    },
    execRun(data) {
      this.AssembleFormData();
      this.drawerVisible = true;
    },
    execDownload(data) {
      const codeStr = this.generateCode();
      const blob = new Blob([codeStr], { type: "text/plain;charset=utf-8" });
      saveAs(blob, data.fileName);
    },
    execCopy(data) {
      document.getElementById("copyNode").click();
    },
    execPreview() {
      const codeStr = this.generateCode();
      document.getElementById('preview').innerHTML = codeStr;
      console.log(codeStr);
    },
    empty() {
      this.$confirm("确定要清空所有组件吗？", "提示", { type: "warning" }).then(
        () => {
          this.drawingList = [];
          this.idGlobal = 100;
        }
      );
    },
    drawingItemCopy(item, list) {
      let clone = deepClone(item);
      clone = this.createIdAndKey(clone);
      list.push(clone);
      this.activeFormItem(clone);
    },
    drawingItemDelete(index, list) {
      list.splice(index, 1);
      this.$nextTick(() => {
        const len = this.drawingList.length;
        if (len) {
          this.activeFormItem(this.drawingList[len - 1]);
        }
      });
    },
    generateCode() {
      const type = this.generateConf.type;
      this.AssembleFormData();
      const script = vueScript(makeUpJs(this.formData, type));
      console.log(this.formData, type);
      const html = vueTemplate(makeUpHtml(this.formData, type));
      const css = cssStyle(makeUpCss(this.formData));
      return beautifier.html(html + script + css, beautifierConf.html);
    },
    showJson() {
      this.AssembleFormData();
      this.jsonDrawerVisible = true;
    },
    download() {
      this.dialogVisible = true;
      this.showFileName = true;
      this.operationType = "download";
    },
    run() {
      this.dialogVisible = true;
      this.showFileName = false;
      this.operationType = "run";
    },
    copy() {
      this.dialogVisible = true;
      this.showFileName = false;
      this.operationType = "copy";
    },
    preview() {
      this.dialogVisible = true;
      this.showFileName = false;
      this.operationType = "preview";
    },
    tagChange(newTag) {
      newTag = this.cloneComponent(newTag);
      const config = newTag.__config__;
      newTag.__vModel__ = this.activeData.__vModel__;
      config.formId = this.activeId;
      config.span = this.activeData.__config__.span;
      this.activeData.__config__.tag = config.tag;
      this.activeData.__config__.tagIcon = config.tagIcon;
      this.activeData.__config__.document = config.document;
      if (
        typeof this.activeData.__config__.defaultValue ===
        typeof config.defaultValue
      ) {
        config.defaultValue = this.activeData.__config__.defaultValue;
      }
      Object.keys(newTag).forEach((key) => {
        if (this.activeData[key] !== undefined) {
          newTag[key] = this.activeData[key];
        }
      });
      this.activeData = newTag;
      this.updateDrawingList(newTag, this.drawingList);
    },
    updateDrawingList(newTag, list) {
      const index = list.findIndex(
        (item) => item.__config__.formId === this.activeId
      );
      if (index > -1) {
        list.splice(index, 1, newTag);
      } else {
        list.forEach((item) => {
          if (Array.isArray(item.__config__.children))
            this.updateDrawingList(newTag, item.__config__.children);
        });
      }
    },
    refreshJson(data) {
      this.drawingList = deepClone(data.fields);
      delete data.fields;
      this.formConf = data;
    },
  },
};
</script>

<style lang='less'>
.sfContainer {
  position: relative;
  width: 100%;
  height: 100%;
  input[type="file"] {
    display: none;
  }
}
.sfScroll {
  &::-webkit-scrollbar-track-piece {
    background-color: rgba(0, 0, 0, 0);
    border-left: 1px solid rgba(0, 0, 0, 0);
  }

  &::-webkit-scrollbar {
    width: 5px;
    height: 6px;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
  }

  &::-webkit-scrollbar-thumb {
    background-color: rgba(0, 0, 0, 0.2);
    background-clip: padding-box;
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
    min-height: 28px;
  }

  &::-webkit-scrollbar-thumb:hover {
    background-color: rgba(0, 0, 0, 0.3);
    -webkit-border-radius: 3px;
    -moz-border-radius: 3px;
    border-radius: 3px;
  }
}

.components-list {
  padding: 8px;
  box-sizing: border-box;
  height: 100%;
  .components-item {
    display: inline-block;
    width: 48%;
    margin: 1%;
    transition: transform 0ms !important;
  }
}
.components-draggable {
  padding-bottom: 20px;
}
.components-title {
  font-size: 14px;
  color: #222;
  margin: 6px 2px;
  .svg-icon {
    color: #666;
    font-size: 18px;
  }
}

.components-body {
  padding: 8px 10px;
  background: #f6f7ff;
  font-size: 12px;
  cursor: move;
  border: 1px dashed #f6f7ff;
  border-radius: 3px;
  .svg-icon {
    color: #777;
    font-size: 15px;
  }
  &:hover {
    border: 1px dashed #787be8;
    color: #787be8;
    .svg-icon {
      color: #787be8;
    }
  }
}

.left-board {
  width: 260px;
  position: absolute;
  left: 0;
  top: 0;
  height: 100%;
}
.left-scrollbar {
  height: calc(100% - 42px);
  overflow: auto;
}
.center-scrollbar {
  height: calc(100% - 42px);
  overflow: auto;
  border-left: 1px solid #f1e8e8;
  border-right: 1px solid #f1e8e8;
  box-sizing: border-box;
}
.center-board {
  height: 100%;
  width: auto;
  margin: 0 350px 0 260px;
  box-sizing: border-box;
}
.empty-info {
  position: absolute;
  top: 46%;
  left: 0;
  right: 0;
  text-align: center;
  font-size: 18px;
  color: #ccb1ea;
  letter-spacing: 4px;
}
.action-bar {
  position: relative;
  height: 42px;
  text-align: right;
  padding: 0 15px;
  box-sizing: border-box;
  border: 1px solid #f1e8e8;
  border-top: none;
  border-left: none;
  .delete-btn {
    color: #f56c6c;
  }
}
.logo-wrapper {
  position: relative;
  height: 42px;
  background: #fff;
  border-bottom: 1px solid #f1e8e8;
  box-sizing: border-box;
}
.logo {
  position: absolute;
  left: 12px;
  top: 6px;
  line-height: 30px;
  color: #00afff;
  font-weight: 600;
  font-size: 17px;
  white-space: nowrap;
  > img {
    width: 30px;
    height: 30px;
    vertical-align: top;
  }
  .github {
    display: inline-block;
    vertical-align: sub;
    margin-left: 15px;
    > img {
      height: 22px;
    }
  }
}

.center-board-row {
  padding: 12px 12px 15px 12px;
  box-sizing: border-box;
  width: calc(100% - 10px);
  min-width: 400px;
  height: 100%;
  & > .el-form {
    // 69 = 12+15+42
    min-height: 100%;
  }
}
.drawing-board {
  height: 100%;
  position: relative;
  .components-body {
    padding: 0;
    margin: 0;
    font-size: 0;
  }
  .sortable-ghost {
    position: relative;
    display: block;
    overflow: hidden;
    &::before {
      content: " ";
      position: absolute;
      left: 0;
      right: 0;
      top: 0;
      height: 3px;
      background: rgb(89, 89, 223);
      z-index: 2;
    }
  }
  .components-item.sortable-ghost {
    width: 100%;
    height: 60px;
    background-color: #f6f7ff;
  }
  .active-from-item {
    & > .el-form-item {
      background: #f6f7ff;
      border-radius: 6px;
    }
    & > .drawing-item-copy,
    & > .drawing-item-delete {
      display: initial;
    }
    & > .component-name {
      color: #409eff;
    }
  }
  .el-form-item {
    margin-bottom: 15px;
  }
}
.drawing-item {
  position: relative;
  cursor: move;
  &.unfocus-bordered:not(.active-from-item) > div:first-child {
    border: 1px dashed #ccc;
  }
  .el-form-item {
    padding: 12px 10px;
  }
}
.drawing-row-item {
  position: relative;
  cursor: move;
  box-sizing: border-box;
  border: 1px dashed #ccc;
  border-radius: 3px;
  padding: 0 2px;
  margin-bottom: 15px;
  .drawing-row-item {
    margin-bottom: 2px;
  }
  .el-col {
    margin-top: 22px;
  }
  .el-form-item {
    margin-bottom: 0;
  }
  .drag-wrapper {
    min-height: 80px;
  }
  &.active-from-item {
    border: 1px dashed #409eff;
  }
  .component-name {
    position: absolute;
    top: 0;
    left: 0;
    font-size: 12px;
    color: #bbb;
    display: inline-block;
    padding: 0 6px;
  }
}
.drawing-item,
.drawing-row-item {
  &:hover {
    & > .el-form-item {
      background: #f6f7ff;
      border-radius: 6px;
    }
    & > .drawing-item-copy,
    & > .drawing-item-delete {
      display: initial;
    }
  }
  & > .drawing-item-copy,
  & > .drawing-item-delete {
    display: none;
    position: absolute;
    top: -10px;
    width: 22px;
    height: 22px;
    line-height: 22px;
    text-align: center;
    border-radius: 50%;
    font-size: 12px;
    border: 1px solid;
    cursor: pointer;
    z-index: 1;
  }
  & > .drawing-item-copy {
    right: 56px;
    border-color: #409eff;
    color: #409eff;
    background: #fff;
    &:hover {
      background: #409eff;
      color: #fff;
    }
  }
  & > .drawing-item-delete {
    right: 24px;
    border-color: #f56c6c;
    color: #f56c6c;
    background: #fff;
    &:hover {
      background: #f56c6c;
      color: #fff;
    }
  }
}
</style>
